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Bioimpacts. 2019;9(3):189-193. doi: 10.15171/bi.2019.23. Epub 2019 Apr 15.

Manifestation of hemispheric laterality in chewing side preference and handedness.

Author information

1
Department of Physiology, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
2
Neurosciences Research Center (NSRC), Tabriz University of Medical Sciences, Tabriz, Iran.
3
Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.
4
Public Health Department, Faculty of Medicine, Tabriz Branch, Islamic Azad University, Tabriz, Iran.
5
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
6
Research Center of Physical Medicine and Rehabilitation, Tabriz University of Medical Sciences, Tabriz, Iran.
7
Self-awareness Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran.

Abstract

Introduction: Humans manifest a behavioral inclination towards more utility of one side of the body, in relation with the dominant hemisphere of the brain. The current investigation assessed handedness together with chewing preference which have not been evaluated in various food textures before. Methods: Nineteen young and healthy volunteers chewed hard (walnut) and soft (cake) foods, during surface electromyography recording from masseter muscles. The side of the first and all chews in the two food types were determined and compared with the side of the dominant hand. Results: Results indicated the two lateralities in the same side considerably (60%-70%), implying the solidarity in the control of the dominant hemisphere of the brain. The unilaterality was more prominent in the assessment of all chews in hard food, with higher statistical agreement and correlation. Conclusion: Thereupon masticatory preference is found with probable origins in the dominant hemisphere of the brain.

KEYWORDS:

Chewing laterality; Food texture; Hand-chew preference; Hemispheric dominancy; Masticatory preference

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